AMD
P R E L I M I N A R Y
3.3 V TAI INTERFACE AC CHARACTERISTICS
Parameter
Symbol
Parameter Description
CLKIN Period
Test Conditions
Min
50
Max
Unit
tCLKIN
tCLIN
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
CLKIN Low time
CLKIN High time
CLKIN Fall time
CLKIN Rise time
RXC Period
22
tCHIN
tINHL
22
Note 8
3
3
tINLH
Note 8
tRXC
Note 5
1000
480
tCLRX
tCHRX
tRXHL
tRXLH
tTXC
RXC Low time
Note 5
RXC High time
Note 5
480
RXC Fall time
Note 8
20
20
RXC Rise time
Note 8
TXC Period
Notes 1, 5, 7
Notes 1, 5, 7
Notes 1, 5, 7
Notes 1, 8
Notes 1, 8
Notes 2, 7
Notes 2, 7
Notes 2, 7
Notes 2, 8
Notes 2, 8
Note 6
1000
495
tCLTX
tCHTX
tTXHL
tTXLH
tTXCO
tCLTXO
tCHTXO
tTXHLO
tTXLHO
tRXDS
tRXDH
tTXDD
tTXDS
tTXDH
tTXDV
TXC Low time
TXC High time
495
TXC Fall time
5
5
TXC Rise time
TXC Period
1000
585
TXC Low time
TXC High time
385
TXC Fall time
15
15
TXC Rise time
RXD setup time to RXC ↑
RXD hold time from RXC ↑
TXD delay from TXC ↓
TXD setup time to TXC ↑
TXD hold time from TXC ↑
TXD delay from TXC ↓
110
10
Note 6
Notes 1, 3
Notes 2, 4
Notes 2, 4
Notes 2, 3
10
200
150
TCLTX-165
TCHTX
0
Notes:
1. Only applicable when TXC has been configured as an INPUT.
2. Only applicable when TXC has been configured as an OUTPUT.
3. MIN value not tested.
4. Parameter calculated from other parameters.
5. Clock period must correlate to data rate as specified in DR bits of TCR30. Note that data rate is a function of DR and TCLKIN and
CLKGT20 bit of MIR9.
6. The values for these parameters are given for the case with CLKP = 0 (TCR2[4:0]). For nonzero values of CLKP, use the
following formulas:
If CLKGT20 = 0 (MIR9[7]),
tRXDSmin = 110–CLKP X TCLKIN
tRXDHmin = 10+CLKP X TCLKIN
tRXDSmin = 110–CLKP X TCLKIN X 2
tRXDHmin = 10+CLKP X TCLKIN X 2
If CLKGT20 = 1 (MIR9[7]),
7. Values given are for data rate of 1Mb/s. For other data rates,
tTXC is 1/DR, where DR = data rate in Hertz,
tCLTX is 60% of TTXC minus TTXHL,
tCHTX is 40% of TTXC minus TTXHL,
tTXCO is 1/DR, where DR = data rate in Hertz,
tCLTXO is 60% of TTXCO minus TTXHLO,
tCHTXO is 40% of TTXCO minus TTXHLO,
tTXHLO is 15 ns, regardless of DR value,
tTXLHO is 15 ns, regardless of DR value.
8. Parameter not included in the production test.
Am79C930
145
AMD [ AMD ]
